Panasonic LUMIX DC-GH5M2GN Operating Instructions Manual page 320

9. Flash – Recording Using a Wireless Flash
3
Enable the wireless flash function of the camera.

≥
4
Set [Wireless Channel].
•
Select the same channel as on the wireless flash side.
5
Set [Wireless Setup].
•
Set the firing mode and flash output.
 
[ ] [ ]

[Wireless] [ON]
320